Hill Repeats 12x1.15min; Jog Down recovery

Had a decent session this morning really concentrating on ‘toeing off’ and ‘running quiet’. I try to use my gluts more and drive from my legs. I am finding though (at time) without a concentrated mental effort I do loose my form and my torso starts rotating and my legs loose cadence. I am coming to the realisation that more ‘core strength’ may not be up to scratch. Ran most of the repeats at 4.15min/k pace. Total 13.19km's